Intel Released Information about Xeon Clovertown and Tigertown

Intel announced that its quad-core Clovertown server CPUs will support new abilities, including lower power consumption, thanks to a new stepping (B3 to G0). The affected models include the entire range of Clovertowns: the X5355, E5345, E5335, L5320 and E5310 which operate at 2.66/1.333 GHz, 2.33/1.333 GHz, 2.0/1.333 GHz, 1.86/1.066 GHz and 1.6/1.066 GHz respectively. Apple does not use such Xeon in its Mac Pro, but we could expect to see the first Penryn Xeon finding their way in the future Mac Pro revision.
On the other hand, Intel unveiled Xeon Tigertown, known as Xeon 7300/7200 series, intended to compete with AMD's Barcelona server CPU to be unveiled in 4 days. Unlike the forthcoming Penryn Xeon engraved at 45nm, the Tigertown will use 65nm engraving process

The Tigertown will be available as Dual (7200) and Quad Core (7300) Xeon CPUs. Unlike the forthcoming Penryn Xeon engraved at 45nm, the Tigertown will use 65nm engraving process. However, a new chipset will allow users to setup 16-core processing power based on the Caneland four-socket server platform. Probably the biggest feature of the Caneland platform is that its four processor sockets are connected to the memory controller hub (MCH) by four 1066MHz FSB, providing a lot of bandwidth.
As pointed before, such processor will be targeting performance server niche market dominated so far by AMD Opteron and the future Barcelona. Apple will probably never use such Xeon platform, and should rather concentrate of getting the most out of the current raw power present in Mac Pro.